The Dachang tin-polymetallic orefield is developed within a belt of Lower Devonian to Tertiary sediments, that intruded by the Cretaceous peraluminous Longxianggai granite. The sediments include Devonian black shales, limestones and argillaceous limestones, Carboniferous and Permian limestones and a younger Tertiary cover. Mineralization occurs in three forms, namely
(1) - Stratabound ore bodies, containing 60% of the tin resource at Dachang: The stratabound ore is composed of small cross-cutting and bedding plane veins developed within particular stratigraphic intervals. The stratabound bodies can contain up to 30% sulphide, mainly pyrrhotite, sphalerite, arsenopyrite and chalcopyrite with cassiterite. Some of the larger orebodies may have dimensions of up to 1100 x 700 x 15 m. These bodies can contain around 1% Sn and up to 4% Zn.
(2) - Stockworks: Stockworks of 0.5 to 1 cm thickness veins with a density of 10 to 30 veins per meter have low average Zn and Sn contents and occur in limestones.
(3) - Veins: They are found at the top of the deposits, are typically 0.1-0.2 m thick, extend for 50-200 m along strike and 100-300 m downdip and have high Zn (to 7.5%) and Sn (to 2%).
All of the different styles of ore are contained within an Upper Devonian unit composed of 5 sub-units, namley black siliceous rock, thick striped limestones, thin striped siliceous limestone, small peas limestone and large peas limestone. The orebodies are found adjacent to a major fault which cuts the Longxianggai granite several hundred metres below the ore zones.
NOTE: Not to be confused with the Dachang (Qinglong) deposit in Qinglong County.
Located about 20 km SSE of Nandan and NW of Hechi.
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References
- Xilin Li and Zhengen Zhang (1980): Sulfosalt minerals in an ore field in Guangxi Province - A restudy. Geochimica 9(2), 172-185.
- Tanelli, G., and Lattanzi, P. (1985): The cassiterite-polymetallic sulfide deposits of Dachang (Guangxi, People's Republic of China). Mineralium Deposita 20(2), 102-106.
- Xilin Li (1986): New contributions to the study of jamesonite group, Dachang ore field, Guangxi, China. Acta Geologica Sinica 60(4).
- Jisheng Su (1989): A guide to ore-finding in the Dachang ore field, Guangxi. Geology and Prospecting 25(10), 16-21.
- Xilin Li and Guanxin Wang (1990): Studies of the tetrahedrite-group minerals from Dachang ore field, Guangxi, China. Acta Mineralogica Sinica 10(2), 119-126.
- Han Fa and Hutchinson, R.W. (1990): Evidence for exhalative origin of the Dachang tin-polymetallic sulfide deposits - their geological and geochemical characteristics. Mineral Deposits 9(4).
- Zhaochong Zhang, Yuchuan Chen, and Jingwen Mao (1994): Alteration characteristics of enriched B and F granitic rocks and their relations to metallogenesis in northern and eastern Guangxi areas. Geology and Prospecting 30(2), 7, 34-38.
- Peng, Z., Watanabe, M., Hoshino, K., and Shibata, Y. (1999): Ore mineralogy of tin-polymetallic (Sn-Sb-Fe-Pb-Zn-Cu-Ag) ores in the Dachang tin field, Guangxi, China and their implications for the ore genesis. Neues Jahrbuch für Mineralogie, Abhandlungen 175(2), 125-151.
- Shao-Yong Jiang, Fa Han, Jian-Zhong Shen, and Palmer, M.R. (1999): Chemical and Rb–Sr, Sm–Nd isotopic systematics of tourmaline from the Dachang Sn-polymetallic ore deposit, Guangxi Province, P.R. China. Chemical Geology 157(1/2), 49-67.
- Pašava, J., Kříbek, B., Dobeš, P., Vavřín, I., Žák, K., Fan Delian, Zhang Tao, and Boiron, M.-C. (2003): Tin-polymetallic sulfide deposits in the eastern part of the Dachang tin field (South China) and the role of black shales in their origin. Mineralium Deposita 38(1), 39-66.
- Delian Fan, Tao Zhang, Jie Ye, Pašava, J., Kříbek, B., Dobeš, P., Vavřín, I., and Žák, K. (2004): Geochemistry and origin of tin–polymetallic sulfide deposits hosted by the Devonian black shale series near Dachang, Guangxi, China. Ore Geology Reviews 24(1/2), 103-120.
- Qin Dexian, Tan Shucheng, Fan Zhuguo, Li Yingshu, Chen Aibing, Li Lianju, Liu Guangliang, Dang Yutao, Tong Xiang, Wu Junde, and Li Yuxin (2004): Geotectonic evolution and tin-polymetallic metallogenesis in Gejiu-Dachang area. Acta Mineralogica Sinica 24(2), 117-123.
- Denghong Wang, Huaqin Li, Yuchuan Chen et al. (2005): Discovery of high－REE calcites in the Dachang superlarge tin－polymetallic ore deposit, Nandan, northwestern Guangxi. Geological Bulletin of China 24(2), 176-180.
- K.-D. Zhao, S.-Y. Jiang, P. Ni, H.-F. Ling, and Y.-H. Jiang (2007): Sulfur, lead and helium isotopic compositions of sulfide minerals from the Dachang Sn-polymetallic ore district in South China: implication for ore genesis. Mineralogy and Petrology 89, 251-273.
- Senkui Fan, Xiudan Li, Yongsheng Cheng, Chengzhen Chen, and Weihong Huang (2010): Geochemical features of vein rocks and their significance to structure and mineralization in the Dachang ore district, Guangxi Province. Geology and Exploration 46(5), 828-835.
- Minghui Ju, Chongbin Zhao, Tagen Dai, and Jianwen Yang (2011): Finite element modeling of pore-fluid flow in the Dachang ore district, Guangxi, China: Implications for hydrothermal mineralization. Geoscience Frontiers 2(3), 463-474.
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